Same issue as others on mid-2011 13" Macbook Air. Battery life has melted away, apparently since installing Mountain Lion. Battery seems to be in good health. Where I used to get 6 six hours, I am now lucky to get three. Updating to the latest version of Mountain Lion (10.8.2) hasn't helped. I notice the fan seems to run when it didn't before, so wonder if there is a particular process causing the problem. Can't find culprit using Activity Monitor. System using 20-22% of CPU, user 5-6%.

I have a 13" MBP mid 2012 which came with a preinstalled Lion, now recently i upgraded it to Mountain Lion (10.8.2) and facing serious battery degradation i.e hardly 5 hrs.My battery health is at 90.8%.

Please recommend what should be done.Will a clean install of Mountain Lion help ?

didn't work for me. i clean installed, called apple and had my battery replaced. in 3 months, my battery life has gone down to 86%. from what i've been told, you complain some, they replace your battery, if your system still shows battery degradation and general shortness of life, and you complain some more, they replace your system. its been said that this isn't an OS problem, its that the OS brings out the previously unseen defects in a system

my fans aren't running as much or as loud, but my battery still *****. i get about 3.5hrs out of it now. I'm keeping track of battery stats with coconutbattery and minibattery logger. proof and stats of the poor battery life seems to get me somewhere faster than without

i dont know what happen now to may mac when i got home i open may mac 7:50pm and i saw the battery percentage at 7: = 94% and i was like shock then it goes down to 6:40=88% and now i got 41%=2:00 and my battery health up for 1% now its 93% i dont know if im going to go back to apple center on weds to give to them my mac for check up =( and i dont know if this improvement will last long... but i'm hoping..

i just arrive from apple service center near here in my work.. and it made me really sad =( they need first to check up my mac and see what causes the problem and i have to wait until 1 week before i can get my laptop back to me " 1 WEEK" without my mac thats a burden... =( is it really that long T_T... and i ask if it's sure that they will replace my battery they said that they dont know they need first to check if its the battery or the motherboard O_O i dont know what to do should i go or wait for another month i still have 6mos to go before my 1yr warranty ends...

A week seems like a long time but they may be shipping it back for further diagnostics and if that's the case a week is a fairly quick turnaround. If they can't sort it out with a bench test, digging deeper is worth it IMHO.

Ultimately you may get a new battery and if that doesn't fix it a new logic board and if that still doesn't solve it a new laptop. Again, it's still under warranty so as Chris suggests, if there's any way you can live without it for a time it would be worth it.

Also, Apple tends to under promise and over deliver. Their standard practice is to give you a worst case scenario. I've only had a few occasions over the years where I had to have one of our Macs serviced, but each time they beat their forecasted delivery date, usually by a couple of days.

FWIW I almost never buy extended warranties...if something's going to go wrong with electronics it usually happens fairly fast, almost always within the warranty period. However you might want to look into Apple Care. It extends the full warranty to three years. It can also cover any Apple peripherals you use. For example I purchased a refurbished iMac from Apple and invested in Apple Care. The iMac was fine but I used an older Apple Cinema display with it. The Cinema Display developed a problem and Apple replaced the logic board in it long after it was out of warranty under my iMac's Apple Care plan...so no charge. There are numerous other stories like that out there. So again, your call, but you have until the one-year warranty expires to buy it if you're interested. I'm not sure where you live but you can often find it for a discounted price from places like Amazon, B&H Photo, etc. You don't have to buy it directly from Apple.

hi, thanks for your advices.. yes i'm planning to buy the apple care but maybe nxt yr still need to save some for that...

and yes i think i just made a final decision on going on weds to bring my mbp to apple service again for checkups and fix and hoping for a battery replacement after reading some posted link here regarding the battery just made up my mind...

for almost 4mos of using it i already have 125 cycles and a 93% of battery life on what i've read i should get 1000 cycles for 80% battery life and i really think that something is wrong...

and hoping that after a week of waiting will have some good news...

thanks again for all the help... by the way currently living in macau,china

i hope also that they can really take care of my mbp.... it's just that thinking of 1week away from my mac is really a pain... i thought it will only take atleast 3days like what apple service in hong kong says but when i go there this afternoon they say 1 week and i can't do anything about it it's their policy or what so ever.. i'm just really hoping that it will worth waiting... =D

I personnaly buy a brand new Mac Book Pro 2 months ago, Montain Lion was included... I can't believe it, my battery only last around 3 hours instead of 7 as it's written everywhere... I'm kind of frustrated every time I'm looking at the time left for my battery. I don't know if it's a problem from mountain lion... In every case, I hope they'll find a way to fix it! I bought a Mac cause I thought the quality was good... It's not really a good beginning! Apple, Do something please!

I personnaly buy a brand new Mac Book Pro 2 months ago, Montain Lion was included... I can't believe it, my battery only last around 3 hours instead of 7 as it's written everywhere... I'm kind of frustrated every time I'm looking at the time left for my battery. I don't know if it's a problem from mountain lion... In every case, I hope they'll find a way to fix it! I bought a Mac cause I thought the quality was good... It's not really a good beginning! Apple, Do something please!

My advie is even though some Apple staff are aware of this hte majority are not and so everyone and that means everyone experiencing this problem should ring Apple Care and log this problem with them especially if you are close to end of warranty. Once you have logged a ticket with Apple Care regarding this issue you can quote it when you go to the Apple store and demnad a new battery which they should replace there and then if they have them in stock and see the problem occuring in front of them.

If everyone calls and logs the problem they will soon take notice. They DO NOT take to much notice of these threads and in fact have told me not to as they believe that people exagerate and tell untruths here. This is what I was told twice.

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